364 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
length to the first pair. The posterior margin of the head is trilobate, 
the median lobe being the largest. & 
The first four thoracic segments are about equal in length, but in- 
crease gradually in width. The epimera of the second, third, and 
fourth segments extend the entire length of the lateral margin. The 
fifth, sixth, and seventh segments are much 
longer than the four anterior segments, 
each being about one and a half times 
longer than any of those preceding. Their 
postlateral angles are widely rounded and 
not produced. The epimera of these seg- 
Fig. 6.— Nerocila excisa, ments extend nearly the entire length of 
First five segments of abdo- the lateral margin and are in the form of 
aramid narrow, elongated lobes, attached ante- 
riorly and free posteriorly. 
The first five segments of the abdomen are about equal in lengli 
All are furnished with distinct epimera, those of the first two seg- 
ments being produced in long narrow lamellae reaching the length of 
two segments beyond the one to which they are 
attached. The epimera of the last three segments 
are small and almost inconspicuous on the last 
two. They decrease gradually in size. 
All the legs are prehensile in character and none 
are furnished with a carina on the basis. 
The terminal segment of the abdomen is lin- 
Fig. 7.— Nerocila guate. In the only specimen the posterior portion, 
excisa. Terminalseg- is almost torn off. The uropoda are also lost. — 
By ie es ea un pe an Locality.— One specimen. Station 13. It was 
found in the stomach of Coryphaena sp., Sept. 5, 1899, in lat. 9° 57 
N., long. 137° 47’ W. 
Tagen Cat. No. 46,435, U.S: N. M. 
b 
' 
| 
| 
IDOTHEIDAE. 1 
PENTIDOTEA RESECATA (Stimpson). { 
Idotea resecata Stimpson, Bost. journ. nat. hist., 1857, 6, p. 504, pl. 22, fig. A 
Pentidotea resecata Richardson, Bull. 54 U.S. N. M., 1905, p. 369-370. 
Locality.— Lat. 33° 40’ N., long. 119° 35’ W. Station 4,571. Fou) 
specimens from surface. | 
